core/com.nokia.carbide.cpp.compiler.doc.user/html/pragmas/p_check_header_flags.htm
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<h3>check_header_flags</h3>
<p> Controls whether or not to ensure that a precompiled header’s data matches a project’s target settings.</p>
<h5>Syntax</h5>
<p class="code">#pragma check_header_flags on | off | reset
</p>
<h5>Targets</h5>
All platforms.<br />
<h5>Remarks</h5>
<p>This pragma affects precompiled headers only.</p>
<p>If you enable this pragma, the compiler ensures that the precompiled header’s preferences for double size (8-byte or 12-byte), int size (2-byte or 4-byte) and floating point math correspond to the build target’s settings. If they do not match, the compiler generates an error.</p>
<p>If your precompiled header file depends on these settings, enable this pragma. Otherwise, disable it. </p>
<p>This pragma does not correspond to any panel setting. To check this setting, use <span class="code">__option (check_header_flags)</span>, described in <a href="../symbols/sym_settings.htm">Checking Settings</a>. The default setting is <span class="code">off</span>. </p>
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